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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e4e9047f08e8412d1adae5321f38a92de9a5711a157655e1e8ed50eda1cc25' 
  AND token = 'XPZfqkUepmM6DmRrYGDaTtUPehpf+izf/+QqeQ4hLu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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