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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebe19baf8efcedfbbb7aee9a76ba54cb56336d540c36c165e9128657477c0a2' 
  AND token = '9hEPyn1UVLfAjKgbM/c+XDpPbae4Uykz0YLc6d/1Hfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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