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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3a112a7ddf2dbbf3ea269c0ee76eb7b6de939c4ac7580b534891c447309eb9' 
  AND token = 'p6ZVTJSavC2TfjZlGWprBA2qm6K4AG+m753cOnn0Gag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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