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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ed68536fb304b950e80e2b7d997d4a15620c923fc9b4427660da4d63f08556' 
  AND token = 'xKlvEVlK9pUEE1LKT6cNeVIpitGli3eWaAH0ehm9Yto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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