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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b856097f080b77d244b8a06e95ef93b35d5552f581b3295a674cff8625c4ce72' 
  AND token = 'xH9KG3eahZCIPLFhOOmywtQO0tQcndp5M4IA6fFJpEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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