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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baaad3b3c45f535a98742f8fe412455edeeae7d3d1b49e5605f231e424505480' 
  AND token = 'UPayUBJHnr7YTb17+vUUqB+FC+be8LjbOBulyJ2FdCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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