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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949cd4fbf00fc1fd6ed80087e67515fb3cdfe49e90d575c1867f68a3c217eedf' 
  AND token = 'pQRKgX1G43XuvswtEFg6DL3nenQeqwJPi7No81fUHW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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