SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c3734746b892daa1cf8b72ca3a648cb221d0d9fc5c16f8c06dc0d622d41da8' 
  AND token = 'ENPvNhM5VPSVBG5DVoYzfHjohkFNropmBRT4qeCJK6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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