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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9055b132db293c7182bb447646b87f7e7643655c3db63a0ce255fdf8d090b1d' 
  AND token = 'SXkC6TXO7bBDKO2pB/ieQAmbFZj5vXudTw8cBcKshVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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