Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49a7f30614862dea6e4a7152bb92f9ee6fb333317f0bde1129371d9d5c36215' 
  AND token = 'zVLjSKa65kUgWQXgB7S8B8fEB+nYcU6V2YCVTYN4rTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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