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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f3e50f086807ad5890778343fa18dd823a72fdd62941c1fc350820fec18974' 
  AND token = '11F9CvvduiDkz7YWRS4DuQDjNAyz0/71KFdxdsKaE1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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