SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc581e2af8f846873b8db55e4b54152d4f4d710fa92e576b16c00a22de9bbcc' 
  AND token = 'hITCUMJvK2ylN1vDhZEShpV/7K5QF2BPYsHYuW1V9bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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