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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2052d52b0d81ae31b9ee050e5205dba35428d238bc5e05e89ec4506f60830ebe' 
  AND token = 'FO1IpxQP4i/ZYIVc1xdvJSks6G0phAavNxH2DJ1FepY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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