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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1a2a23385fb7d7fd9af874683273e41cd7edf730d8af65d9a6894945be36f5' 
  AND token = 'g2tNonu9z00DOwfCHdOZKYtUIQr+kfDBkQEZ0H+leb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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