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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0304f71dbea5883f55956ea3ff0006c5bdc6c92bd3195e4d810b941698eaa273' 
  AND token = 'HAJd2cVz6jh4kgZMeZa5cplKhr00WVRtIvit0jd6eEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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