SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a622ac5241441a7731fc9932aa502e134e21d0ffb6e9611e0fe98e7db6c39333' 
  AND token = '0zHoX+qb8Z59GgolXJIvWdw8gFu5DViV+wwc2iYIyIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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