SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db88cad184d8e0252f7f95b163e24b5a938ffab43de6ef977123a3c10baf36f5' 
  AND token = 'YNtiNRZDYgx7bpJOumRIgFVB9zpXRqlRikcDqVpc26I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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