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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9860a3aeeb4458614f2563eaff78e27a81133df2b17b70f1e57c7b6f098ec6ae' 
  AND token = 's2FBabiux+CEenknyuKDRgJ9kvIEgcWx4dUatq9E7tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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