SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4d8ce2fca39f161835c27170961aa1c9879bbca0540d1e194db0f8d14b64d4' 
  AND token = 'J+9eNm1FRt/Yhzqi1ofOvPu+uON3GpsiGPCJZfg8Ptc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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