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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4f0b1a219cfd1e2ec5dd4145a092db96bbe64232268128884e9c19c4504144' 
  AND token = '1nTXR92th7uFZ7/qGn23tAVoyeQSviI18rrPcyx1ZRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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