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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd9d86262ab9860a881dbc02c1428eeb72b735220872c2cd97b23ca19f88cc4' 
  AND token = 'xcTLiwUuC4ziMbU+92JMSA7yNBgx1QkxIFv9BBCla2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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