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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2d41716522d6c106f0174e5811bdf8644c225894faac19ed49bb564f3daff1' 
  AND token = 'V6Sq7GN4mZRGUEzuo6QRSo8Xi/61EClAg5xa5k4d8d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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