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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2107e095a71ceb894c4708ca8d6f22f588981313a04e5b39973f148fc7d70cd7' 
  AND token = 'c1KGGjqQoqEvBXqCKHno8MykSRD3AcmSHGhx8H8bFPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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