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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e442dbd098d450915e7b873faaa295352d47814700562c4d0c6290b501d248cd' 
  AND token = 'Nr8b5ejvCwkyD75CyXzAtHwxlW0dxNRFUi9KnVB7dcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}