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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cebea931dbe95772eb909e1ef0895d8f566df26369c2889bcad277b68273e1f' 
  AND token = '5mIUVqVZ900l4G5bVAbZ3hpdx7HBTRi8I4KMatXhiUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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