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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffb30d5d85844a783aaf6ba756a408b38211eb934c9cb7bf9bf579fc90f7222' 
  AND token = '7U8c6DCtBB4EgdTVyIkfOr6T522HtixroGD89SUzRCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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