SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7eadaa0d94a2597ba7a7ebc526bf4005f030dc27a0d72e0daa348b125bf693' 
  AND token = 'XKRfAjAa4U4qpmIj1C8qJLL/OFYthxt+iPowZPv/UvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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