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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73696c44dffa07cb53124dcf04e0df0155d4c3cc4deca94e3ef26342acf44548' 
  AND token = 'wz1rQU0Mj7+d9RO/7hFidl862KC/YCStDtJP4B/FzPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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