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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832f92ade3f96d42aae250e80e88ec89c555d8b8cf6bcce37c5d7e1b3fdb5f02' 
  AND token = 'M/I7o95gwcc3o0Zbm+v4+RssA0rAO2YD+TXyqabW1ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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