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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ad862f62932f3b47050c1fa427ae9ea3fb20032b064ec66ee51378e9cd1b8f' 
  AND token = '9K1mRySXaUleZbCQz9WtWFZ9LJC67B4dcQkwd4JN4KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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