SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b5efe48e67715ba25d22c01fc727846de43b9ef3f59a09624fd81e6ba7bc81' 
  AND token = 'tlgZpKmxAwMbfC+sh+VkFDrTrfMBxhPLF5D9wjMqRTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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