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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dc1dc1be2be333bd99f81dc1225257c33b6413eb1095a1ac744c125ecc234a' 
  AND token = 'fIVC3bOa/YOdCziXJIZ4J5n4gjVSJKxDEoqqxab5lt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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