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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d52db29088216ed433668120d9a980349bf22cdc630fffc35b5de6c04413cc' 
  AND token = 'N7C8sa37XZUAKcPYjvdiTS8BsrYSYNhMCZ+71ROBU9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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