SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48d9f8935efd52b7d1a7988d9213ba9efbdf828202387504fc7d45eac770658' 
  AND token = 'BHoLaGpIfFdoJTUn30Bk2qJYjQFZqEOuCs7j4pJuS/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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