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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985f202f6a2edc284db773a116112d883b342f019f72077e2f504761d5bb7c6f' 
  AND token = 'B4FEi8ECIWADoaLgTNIUmy6zYgUcP+yhqIS8A6ZQPM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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