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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bc83d5860372eb79b1fdefc446d8a3b081edf4b890bc4c0d7b42bb3057f825' 
  AND token = 'kWcox81nnBvLl4hT+jgNZE8jKoPUUgopmYn+NQlgD9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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