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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24dd70719e6a9db5529b7a919b8b852d88479f53ef7a5080bd4341c35327779b' 
  AND token = 'yN50HKzP7dAldwVULraE6cUchNhYylGMeOg1H+uN6d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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