SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb805fd6d7eb4d2c8c5e43e367f0a64d1db7d48660fc7321c3045951ce108f1' 
  AND token = '2w/lh9V1sVIaVKxN6F3QTgvk/PzLxz3vgp+nFjDpXWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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