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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab56222aa50b9eab249edf1df329a79b43e2b5e2b98844fa1266fc6a046e120' 
  AND token = 'Klvk8yj3YxKmjoz0lekOHBNBs1SXWIJC3XmmQvBqJxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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