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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc7831625280e143f12adea7759d22f61cc6c2cecf03f7978604863f167b637' 
  AND token = 'JLT7wDfsoWPT8TyHtqmR7g8Ytk+J9e4NUN88jS69pK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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