SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc12645b0fe09b695cf8c3442cf35575823c88e146a078637782e9f6c48c485' 
  AND token = 'klCnaKZvLp99Aj3vZCjl26BUuCvQ0jjqHfSxiNI/nws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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