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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04970179e72c642151aaae343d8390ea21eced5dfea7d708c51ea933e609625d' 
  AND token = 'WA8ZG04mZOIjwgn6uiZrsH2XYxTADxWO9K2aqm+BoyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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