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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a227ed644a3d0164a9e88d8941207e6b63858ec7fa784718e75509b21a501ebf' 
  AND token = 'rZ+Q4fnG7ndsAGOVfvFXT6GmDI5OivP0FMAX8ylezOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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