SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc9f41a288cbb9cd6c8010800fef4353e6b33cb4faa86b0568094072d74f02c' 
  AND token = 'wrTJcK8GQe5Ch/JVEbPUiKv6iZrUlCpYGPZDAH2ZE+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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