Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be521e95d4f3b98dee880fa0389de61bd48d08586703a3e646439d1b1c7a90c1' 
  AND token = 'lTaOhm4dGnJQOqvJIWvn/IfeoojGWdIYeORlpFxdSnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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