Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a77495da7624da485b807ca5b0eba18933e266752ac63cc9443d8dc447a558' 
  AND token = '6kTq00pTUyQ7cWX2p+js56jD8g7doLz/UrFmUTje3i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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