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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f1da3b353cf8be5c16f115d6549e7d8334d8b09a27bc0e0d0e54ef7c33784f' 
  AND token = 'CT1worNSkF5Q3nHFR+4Ua8c5WxEdt1tDzNqQOS/xWPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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