SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7243b32084245d8ac92c1f6fb7cefb325ed7eb95c48bdf06076f375b64442f' 
  AND token = 'YDLWypI0JC5VK8GuPutOFzhNIKImb2j5rWjVbq+RQKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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