SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0365b47611257e6576c8dd89f081e5310d761c6300a9c95ff7cbc5a3e3f6a874' 
  AND token = 'vNqg5VIKriG+s9VpwQItHtBy7f99+x6l1nG9ioLpljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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