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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dce7e2123db7218084e8397a303873f0fb92a3c5aa8e1bf019769e50899a515' 
  AND token = 'CLgy099yfjeydl25l8tS5hPLHtWgO2QnKVESLv2TBaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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