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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a9ac349e4ea635157e3d7bcb5d13deb9f2e33600c56dfa498fa3f9a4b6dbbf' 
  AND token = 'Q3ZtED2VqGdWxHWbMilj+vok/lZKDEzm03s6P9C/368=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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