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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035f4b2abfc8ad143ed7b062ce0cac92b44ea9c9643f194e37fdafc19631f852' 
  AND token = '4QdOz1fMIoFHWZgu7idk+zQy+jUBNq7ujSoH6nh2FbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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