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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef4161b4ea1e1c2e73f28a518596c73026e662fe255979251b1f87b090124b9' 
  AND token = '2I9BlaQjr9iRc9OO4A1AVp7g2XI4m/7obiMtOJvXNyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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