SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf17f6e0892b7d79d10be74cfc97c28b158e098bcfe2d6378c4e16c7ee8a438' 
  AND token = 'mZ92FGbWv+Q5C2RShyxOPEv3pXTKYUWZwgQjWPF+T8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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