SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7202e5f0114e6571a4f9217e742f13c6140f8de46b68923c715a433653e9a8' 
  AND token = 'dKvDq2Q1gAXkg/PvjnJHDN7v5c/3FOsVkIERNBVuhwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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