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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbb6871acee69cfcf512ca08b95d9a4036b897795d8f70f2f4f329411c14d86' 
  AND token = 'Bc9pn+1KIH21KAaqX3E1ydXZ/0DEfEcTr5LRrw8UbQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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