SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb79aa0521734e7c732fb12dda9c5892e9d0725f1eaa1f4c181b1a5e88a7f55' 
  AND token = 'gId3cqHPUIDjGZ+ihWP6AzdwxQoh69ihsYlgS96TCI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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