SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581af50d71d8119e6a39464fd3bc0197b862fea501308e8f91602a8f5c322d71' 
  AND token = '/9STHMAYVRvVrqYEFQbv2qJBZFT6w33GkxWBHLgcUEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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