SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65207d20d596be7984e63962e9d82401eb9a4c54ff9bb484c2ed5c1b6edbfd69' 
  AND token = 'vbQzn5s0qKYcVIxl+aVALijmqRtpFKdazguIhqbGx9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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