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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5236262b1117737ce186d15c44cdf0afce6244c4f765d342df34fb994b56bd69' 
  AND token = 'Fm17EX9ienJCQkX3hZuFP6LO2Qp6W9vD8W3NeRihVNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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