Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51509d51b3865869f98a25555173cb766f1d3b4e00f33aaddb913ea54ccffb79' 
  AND token = 'sCW+k/XWpJoaj1Mc0/22m7vvAN22nCtmuQbCbi2w/Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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