SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac72d84c07fe019ff5c04a529715e4a4bdd97e8a24ab1dcfbb6320b9eb8367d' 
  AND token = 'laiJQ3PkvCNYzJPPoYpBQz1O+vW+E7Hg0RfffnqgUV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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