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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c943cb59b804e0f1e1a6bc1b0b6c81368662ed6322d2e24c819aa8e3af1af5d5' 
  AND token = '498sQmDz+CJxdxohpqzn/LfI/TjdqSf/zrwDx+am28w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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