SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4332ef5ae631f998fa2a2fca6bf572b30b4470604501457585727f5d38799616' 
  AND token = '38/C6fq1KjVTn/zRQbZD68Whpf9luRQfphP843hdGUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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