SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c464659142e64767c86b33cf76e933420be7c0bf5088f449d183a852eabca0d' 
  AND token = 'C2uXO1dEMWHqyIF+3zPGus0jN0z7orZQkJuUv7ZPCYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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