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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0e1bc0814357818e4fd090d381867ead14cf454efaccc9e193b1f839f93470' 
  AND token = 'kzTvpHZiZ922Um2p6kDVC3pmzmMnuThZbjErlf+lM2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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