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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76bf37654c8dde1e5d03ea7cef1433d452ad7c4da63f28a3f4753a5361c32ef' 
  AND token = 'GR3UiQCVpXtA4aIxWzNpNxqgJeoITiQc9Uc/wt5K/0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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