SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e7c0d45ef93e244ebf995d7a9b3b698c68c67c5c74f98dc2653d4611d0a982' 
  AND token = 'elP1vlRzom3wtHijcRDFxuL10VGA2Bjn5IW0xqZIKvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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