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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744d88ac977f23cebac4312464589797c755c2ac2127981bce9e77cb2f8c2ad8' 
  AND token = 'LOp190BWo65rVA/wmReujHOgI2VZtcG7wgZL9HJKlYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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