SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4443fb3f5c306d1053b4ff3ae8b18c0dac690230a15129c7c672fbc3f31bf94c' 
  AND token = 'TwABRQv9VXqTLgjcNWuH+eH+ZMFcVrYSY2eMzhFHw3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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