SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd605d217535f239df667f3f32d13eb0ab226a91f662aea9b785d89f9a08764a9' 
  AND token = 'qJnSTBHKHzhSpC0ERZ8Z6t9U1ZY5O8Zm47VMDlILuD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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