SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ea7f2d5502cc479c4ed21a611412be293352d72312b63ef651a2ad242501cb' 
  AND token = 'zq/vX8Dh8bcaHINkBp/bvxFYQwbsfKfuOXDpBu+1xCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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