SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7379a89185b165780afd57ca90a5603ae6653500701a694bb1b63f151680d814' 
  AND token = 'ZFbvbZKtf5VP6q0Yhic+qPjQqfpvFB+jweGr3e428cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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