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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c016cee1373132c1b058b4d18456de4048a7bb3016b89850a7e94a4ac461bda' 
  AND token = 'q3Y/gmHjOOod8SYakjsGp4OFjwjZJihqMX+lSu28goo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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