SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95476149c1c8d00467fb15c45d0e7f056a6973f9fb4774f655b9c9c3e89101ba' 
  AND token = 'V0LJVVos/w8ZX7/jBF+zFInzUdekCPzEvEnyvUOVG2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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